The white bottle is what you should be running with cold temps coming, although us middle of the country folks don't have to worry to much about gelling. If you read on the bottle they give to different strengths, one is double the other, so adding a bit more won't hurt a thing. If you are still worried burn 10 gal and go fill her back up with fuel. Wal,art has these slick funnels that have calibrations on the side and a shut off valve with a long filler hose. You can close the valve fill to the right level , put hose in the tank then open the valve, makes adding the Power service very easy.